Initially, this was just simplified down to (cost/cps + cost/Δ cps), but thanks to a number of repeated simulations by Vandalite, it was found that adding a modifier to the (cost/cps) section very slightly increased the optimal build speed, as can be seen here:

Example

For Golden Cookies, it was determined that using the naive cost/Δ cps to determine when it is optimal to begin building a bank for Golden Cookies is superior to our primary efficiency algorithm, since you actually gain effective CPS increases continually while building bank (from increased Lucky payouts).

All of these calculations are subject to change if it is revealed that a different algorithm will build (and maintain) a CPS base faster than the current one. Additionally, there is uncompleted code that will simplify these numbers to a simple percentage-based system for easier user reference.

Next Purchase: This is what FC's formulas have determined is the optimal next purchase, and if autobuy is turned on, is *what* FC will buy next.

Building Chain to: This is only visible if FC has calculated that the best purchase is an upgrade that has prerequisites that are not yet met. In that case, this is that upgrade (whereas the "Next Purchase" will be the recommended prerequisite to purchase).

Time til completion: This is how long, at your current CPS, it will take to purchase the Next Purchase. This includes any calculated needed GC Bank.

Time til Chain completion: Only visible if building to a chain, this is how long, at your current CPS, it will take to purchase all prerequisites and the target upgrade.

Cost: The cost of the Next Purchase.

Golden Cookie Bank: The amount of cookies that FC has calculated you should keep on hand as a bank to maximise the value from Golden Cookies.

Base Δ CPS: The total amount of displayed CPS that will increase from the Next Purchase. (This includes all bonuses, regardless of what items they're on - it's just the raw amount that your CPS will increase above the Big Cookie.)

Full Δ CPS: The amount of estimated effective CPS that will increase from the Next Purchase. This is the Base Δ CPS + the amount of change in the estimated CPS value of Golden Cookies.

Purchase Efficiency: This is the efficiency calculation for the next purchase. If building to a chain, this may temporarily appear much worse than other options. If the recommendation engine formula changes, this number will too.

Chain Efficiency: Only visible if building to a chain. This is the efficiency calculation for the entire chain. (This currently does not take into account CPS increases from the purchase of prerequisites, and thus is actually under-estimating how efficient the full chain will be, to simplify calculations. This may be changed at a later date.)

Golden Cookie Efficiency: This the efficiency calculation of holding on to a bank of 10x Max Golden Cookie Value (and thus maximize the amount of Cookies earned across all Golden Cookie clicks).

Current Average Cookie Value: This is the average value of Golden Cookies with your current CPS, Cookie Bank, and upgrades. This is the idealised equivalent to clicking 1000 Golden Cookies with your current CPS/Bank/Upgrades, and then dividing the total amount of Cookies gained by 1000. If your GC Average is currently maxed out, then this will be marked as *(Max)*.

Max Lucky Cookie Value: This is the absolute maximum value that you can get from a Lucky! Golden Cookie, with the upgrades you have purchased. (Specifically, if you have Get Lucky, it's 8400 * Current CPS; Otherwise, it's 1200 * Current CPS).

Cookie Bank Required for Max Lucky: This is the amount of cookies needed to maximise a Lucky! Golden Cookie. It's just the previous value * 10.

Estimated Cookie CPS: This is a rough estimate of how much CPS you'd effectively add by clicking every Golden Cookie.

Golden Cookie Clicks: The number of times you've clicked a Golden Cookie.

Missed Golden Cookie Clicks: The number of times you've *not* clicked a Golden Cookie before it faded from view.

Last Golden Cookie Effect: The internal name of the last Golden Cookie effect.

Total Recorded Frenzy Time: The total amount of time (while FC was loaded) that has been spent in a Frenzy.

Total Recorded Non-Frenzy Time: The total amount of time (while FC was loaded) that has been spent not in a Frenzy.

Cookies to next HC: The number of cookies needed to gain one more HC after reset.

Estimated time to next HC: This is how long, at your current CPS, it will take to make enough cookies to gain one more HC after reset.

Time since last HC: This is how long it has been since the last time you gained an HC.

Time to get last HC: This is how long it actually took (including lucky bonuses, frenzy time, etc.) to gain the last HC.

Average HC Gain/hr: When the last HC was gained, this was the total number of HC that have been gained (ever) since the last reset, divided by the total amount of play time. Used in conjunction with the next value, this provides a (very) rough estimate of when you should begin to think about resetting. (When Average HC/hr is constantly less than Prev HC/hr.)

Previous Average HC Gain/hr: This is the same calculation as the previous, but for the HC prior to the last one. (Yes, it's confusing. Sorry.) false

Base CPS: This is how many cookies you create every second, when a Frenzy is not active. (Marked with (*) when this is the current CPS.)

Frenzy CPS: This is how many cookies you create every second, when a Frenzy is active. (Marked with (*) when this is the current CPS.)

Estimated Effective CPS: This is an estimate (over time) of roughly how many cookies you create every second, when including the effects of clicking Golden Cookies. This will currently be the same as the Base CPS if Autoclick GC is turned off.

Currently will not ever buy or recommend buying the Sacrificial Rolling Pin. (Due to not modelling the cost of the Elder Pact as lost CPS.)

Reports of people buying upgrades and having the cost deducted, but the purchase reverted has been noted. This is difficult to reproduce and may have already been fixed, but that is not currently guaranteed. Recommend saving before making any large upgrade purchases, just in case.

When loading the script in version 1.0465, notifications will appear implying the obtaining of some achievements that may have not yet been earned. However, no achievements (aside from Third-party) are actually obtained in doing this.